粵典 (words.hk)香港詞
一啲唔係講出嚟，而又傳遞到指示、訊息嘅行動；可以係手勢、動作、燈光，甚至電流，唔一定係人睇得明嘅，有時係畀特定嘅設備或者儀器用（量詞：個） (signal; something that conveys a message without speech including gestures, movements, lights, or even electric current and can extend beyond a specific device or instrument)
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